Article
Geochemistry & Geophysics
Joost Hase, Grigory Gurin, Konstantin Titov, Andreas Kemna
Summary: This article presents an approach based on Debye decomposition for converting time-domain induced polarization (IP) data into frequency-domain complex resistivity models. The conversion scheme is implemented using a non-linear Gauss-Newton inversion scheme and is validated through synthetic and field data studies.
Article
Geochemistry & Geophysics
Wu CaoWei, Zou ChangChun, Wu Tao, Zhou JianPing, Tao ChunHui
Summary: Seafloor polymetallic sulfides are considered strategic and promising metal resources for the future. This study introduces the theory of intrinsic semiconductor polarization and proposes a method for evaluating the physical properties of disseminated seafloor polymetallic sulfide rocks. The method can effectively evaluate the induced polarization characteristics and identify possible polarization sources inside the rock. It can also be used to evaluate the volume content and grain size of sulfide particles.
CHINESE JOURNAL OF GEOPHYSICS-CHINESE EDITION
(2022)
Article
Chemistry, Multidisciplinary
Zhao Ma, Lichao Nie, Zhaoyang Deng, Xiaobin Xu, Xin Yin, Junfeng Shen, Kai Wang, Ningbo Li
Summary: The induced polarization method is sensitive to water and water-bearing porous media, making it a popular method for evaluating formation permeability characteristics. The relationship between relaxation time and permeability was studied using different quartz sand samples, and it was found that they are closely correlated with the grain size.
APPLIED SCIENCES-BASEL
(2022)
Article
Mathematics, Applied
K. Gorska, A. Horzela, T. K. Pogany
Summary: This study examines the description of dielectric relaxation phenomena by non-Debye and non-exponential behavior, combining stochastic methods and fractional dynamics approaches to gain a new understanding of the evolution laws of relaxation phenomena.
COMMUNICATIONS IN NONLINEAR SCIENCE AND NUMERICAL SIMULATION
(2021)
Article
Multidisciplinary Sciences
Charandeep Singh Sodhi, Luan Carlos de Sena Monteiro Ozelim, Pushpa Narayan Rathie
Summary: The dielectric spectroscopy of human blood was studied to diagnose diseases and analyze statistical modeling using Modified Weibull distributions. The re-analysis showed improved accuracy in fitting parameters compared to Gaussian distributions. Exact expressions for complex permittivities and a high accuracy approximation for the imaginary part were obtained, providing a practical alternative for practitioners.
Article
Geosciences, Multidisciplinary
Shu Wang, Tianyi Wang, Jin Yang
Summary: By establishing two- and three-phase medium models and using the generalized effective medium theory and Debye decomposition method, the electrical characteristics of rocks and ores were studied. A numerical simulation program was developed to analyze the complex resistivity spectral characteristics and relaxation time distribution. Seven representative ore samples were selected from different mining areas, and their complex resistivity and phase spectra were measured and analyzed. Theoretical model curves were fitted to the measured curves using the differential evolution algorithm, and the variation characteristics of the curve parameters were analyzed. The generalized effective medium theory can guide the study of induced polarization anomalies from the structural and electrical properties of rocks and ores, which is important for energy resource exploration, deep prospecting beyond 500 m, and environmental investigation by electrical (magnetic) methods.
FRONTIERS IN EARTH SCIENCE
(2023)
Article
Geosciences, Multidisciplinary
Shu Wang, Jin Yang, Peng Su
Summary: Spectral-induced polarization data can provide information on the polarization properties of underground media. This study used the Debye decomposition method to directly invert SIP data and extract the characteristic relaxation time of the target. The linear inversion method was used to verify the effectiveness of the inversion. The results showed strong correlation between the parameters of the Cole-Cole model and suggested that expanding the range of relaxation time can alleviate the influence of truncation error on inversion.
JOURNAL OF APPLIED GEOPHYSICS
(2023)
Article
Physics, Applied
S. K. Jena, D. C. Joshi, S. Ghosh, K. Dasari, S. Thota
Summary: This study presents a detailed investigation on the dynamical response of electron hopping and dipole relaxation in Zn diluted Cuprospinel polycrystals, revealing various polarization mechanisms and relaxation phenomena. The analysis of dielectric dispersion and ac-resistivity provides evidence of charge transport behaviors at different temperatures, while electric modulus spectroscopic studies reveal two types of relaxation phenomena. The study also suggests the potential for designing low energy-loss and high-resistive electromagnetic elements for microwave devices based on the compositional dependent tunability of the parameters discussed.
JOURNAL OF PHYSICS D-APPLIED PHYSICS
(2021)
Article
Physics, Multidisciplinary
William Beatrez, Arjun Pillai, Otto Janes, Dieter Suter, Ashok Ajoy
Summary: We report on experiments that quantify the role of a central electronic spin as a relaxation source for nuclear spins in its nanoscale environment. Our strategy exploits hyperpolarization injection from the electron as a means to controllably probe an increasing number of nuclear spins in the bath and subsequently interrogate them with high fidelity. These results suggest interesting new means to spatially discriminate nuclear spins in a nanoscale environment and have direct relevance to dynamic nuclear polarization and quantum sensors and memories constructed from hyperpolarized nuclei.
PHYSICAL REVIEW LETTERS
(2023)
Article
Geochemistry & Geophysics
Charles L. Berube, Frederique Baron
Summary: Mechanistic induced polarization (IP) models describe the relationships between the physical properties of geomaterials and their frequency-dependent complex conductivity. However, practitioners rarely use these models due to uncertainties in estimating petrophysical properties from complex conductivity spectra. We propose a framework using a conditional variational autoencoder (CVAE) to assess the sensitivity and parameter estimation limitations of any IP model. Using synthetic mixtures of metallic mineral inclusions in electrolyte-filled geomaterials, we trained the CVAE and found that certain petrophysical properties play a more critical role in generating spectral IP data. Furthermore, constraining electrochemical properties improved the estimates of metallic inclusion size.
Article
Engineering, Environmental
Yang Fei, Xiaoyan Wang, Feng Wang, Wenke Xie, Qiye Wen, Xu Xiao
Summary: By introducing a covalent chemistry strategy to the metallic Ti3C2 Tx MXene through constructing the polysiloxane/Ti3C2Tx interface and using the directional-freezing process, researchers have successfully obtained a covalently bonded MXene based aerogel (CMXene) that exhibits broad effective bandwidth and high absorption performance in the terahertz (THz) band. This finding may enable the design of dual band absorbers for GHz and THz frequencies, which is relevant for 5G/6G applications.
CHEMICAL ENGINEERING JOURNAL
(2023)
Article
Geography, Physical
Jianlong Wang, Biao Hou, Bo Ren, Yake Zhang, Meijuan Yang, Shuang Wang, Licheng Jiao
Summary: This paper proposes a parameter ordering scheme and a parameter selection scheme based on Touzi decomposition for PolSAR image classification. The loss function of the autoencoder network is modified according to the different data distribution of the selected parameters, and an improved autoencoder network is proposed. Experimental results on four real PolSAR images show that these schemes can improve the overall classification accuracy.
ISPRS JOURNAL OF PHOTOGRAMMETRY AND REMOTE SENSING
(2022)
Article
Chemistry, Physical
Purbasha Sharangi, Esita Pandey, Shaktiranjan Mohanty, Sagarika Nayak, Subhankar Bedanta
Summary: Organic semiconductor/ferromagnetic bilayer thin films exhibit novel properties due to the formation of spinterface at the interface. C60 shows ferromagnetism at the interface with ferromagnetic metals like Fe or Co. Enhanced magnetic anisotropy in CoFeB thin films can be achieved by introducing a C60 layer, while the magnetic domain structure remains unchanged in the bilayer samples compared to the reference film.
JOURNAL OF PHYSICAL CHEMISTRY C
(2021)
Article
Materials Science, Multidisciplinary
Daniela Pagliero, Pablo R. Zangara, Jacob Henshaw, Ashok Ajoy, Rodolfo H. Acosta, Neil Manson, Jeffrey A. Reimer, Alexander Pines, Carlos A. Meriles
Summary: In this study, magnetic-field-dependent activation of nuclear spin transport from strongly hyperfine-coupled C-13 sites in diamond was demonstrated using field-cycling-assisted dynamic nuclear polarization and continuous radio-frequency driving over a broad spectral range. The findings were interpreted using a theoretical framework where nuclear spin interactions are mediated by electron spins, and localized nuclear spins must thermalize when in contact with a larger ancilla spin network. Additionally, stark changes in the RF-absorption spectrum were observed by probing the system response to a variable driving field amplitude, partly attributed to contributions from heterogeneous multispin sets with zero-quantum transitions becoming RF active thanks to the hybrid electron-nuclear nature of the system.
Article
Multidisciplinary Sciences
Moaz Waqar, Haijun Wu, Khuong Phuong Ong, Huajun Liu, Changjian Li, Ping Yang, Wenjie Zang, Weng Heng Liew, Caozheng Diao, Shibo Xi, David J. Singh, Qian He, Kui Yao, Stephen J. Pennycook, John Wang
Summary: In this study, the authors demonstrate a giant electric-field-induced strain in alkali niobate epitaxial thin films with self-assembled planar faults and elucidate its origin. The findings have important implications for developing high-performance sensors and actuators.
NATURE COMMUNICATIONS
(2022)
Article
Geochemistry & Geophysics
Grigory Gurin, Konstantin Titov, Yuri Ilyin, Andrey Tarasov
GEOPHYSICAL JOURNAL INTERNATIONAL
(2015)
Article
Geochemistry & Geophysics
Pavel Konosavsky, Alexis Maineult, Mikhail Narbut, Konstantin Titov
GEOPHYSICAL JOURNAL INTERNATIONAL
(2017)
Article
Geochemistry & Geophysics
Daniil Chuprinko, Konstantin Titov
GEOPHYSICAL JOURNAL INTERNATIONAL
(2017)
Article
Geochemistry & Geophysics
Alexis Maineult, Andre Revil, Christian Camerlynck, Nicolas Florsch, Konstantin Titov
GEOPHYSICAL JOURNAL INTERNATIONAL
(2017)
Article
Geosciences, Multidisciplinary
G. V. Gurin, A. V. Tarasov, Yu. T. Il'in, K. V. Titov
RUSSIAN GEOLOGY AND GEOPHYSICS
(2017)
Article
Geosciences, Multidisciplinary
Grigory Gurin, Yuri Ilyin, Sergey Nilov, Danil Ivanov, Evgeny Kozlov, Konstantin Titov
JOURNAL OF APPLIED GEOPHYSICS
(2018)
Article
Geosciences, Multidisciplinary
Grigory Gurin, Konstantin Titov, Yuri Ilyin
GEOPHYSICAL RESEARCH LETTERS
(2019)
Article
Geochemistry & Geophysics
Grigory Gurin, Konstantin Titov, Yuri Ilyin, Ekaterina Fomina
Summary: Electrically conductive minerals are found in various geological contexts and characterization of rocks containing electrically conductive inclusions is crucial in many sectors. Laboratory measurements show that the shape, size, and composition of the inclusions significantly impact induced polarization parameters. The experimental data indicate that the polarization magnitude of electrically conductive inclusions is proportional to the normal component of the electrical current density on their surface.
GEOPHYSICAL JOURNAL INTERNATIONAL
(2021)
Article
Geochemistry & Geophysics
Tina Martin, Konstantin Titov, Andrey Tarasov, Andreas Weller
Summary: This study explores the application of laboratory IP experiments in both time domain (TD) and frequency domain (FD). Differential polarizability (DP) can be used to compare FD and TD data, while relaxation time distribution (RTD) helps to qualitatively compare the data in both domains. The results show that DP and RTD are more in agreement with higher data quality in TD.
GEOPHYSICAL JOURNAL INTERNATIONAL
(2021)
Article
Geochemistry & Geophysics
Grigory Gurin, Konstantin Titov
Summary: In this study, IP data was measured on a synthetic capillary model for the first time. The chargeability was found to predominantly depend on the active to total surface ratio of the pore cross-sections, rather than the volumetric content of metallic particles (MP). Additionally, the relaxation time of the capillary model was found to be influenced by bulk resistivity, MP resistivity, and the specific capacitance of the 'MP-pore water' interface.
GEOPHYSICAL JOURNAL INTERNATIONAL
(2023)
Article
Geochemistry & Geophysics
Joost Hase, Grigory Gurin, Konstantin Titov, Andreas Kemna
Summary: This article presents an approach based on Debye decomposition for converting time-domain induced polarization (IP) data into frequency-domain complex resistivity models. The conversion scheme is implemented using a non-linear Gauss-Newton inversion scheme and is validated through synthetic and field data studies.